[Feature] Add TTSR-GAN

[Yshuo-Li]

No description provided.

[codecov]

Codecov Report

Merging #383 (3fd231d) into master (2efae2b) will increase coverage by 0.28%.
The diff coverage is 90.54%.

@@            Coverage Diff             @@
##           master     #383      +/-   ##
==========================================
+ Coverage   80.43%   80.71%   +0.28%     
==========================================
  Files         186      186              
  Lines        9936     9978      +42     
  Branches     1450     1463      +13     
==========================================
+ Hits         7992     8054      +62     
+ Misses       1749     1721      -28     
- Partials      195      203       +8     

Flag	Coverage Δ
unittests	80.69% <90.54%> (+0.27%)	⬆️

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Impacted Files	Coverage Δ
mmedit/models/restorers/ttsr.py	66.40% <87.71%> (+11.52%)	⬆️
mmedit/models/backbones/sr_backbones/ttsr_net.py	96.25% <100.00%> (ø)
mmedit/models/extractors/lte.py	95.65% <100.00%> (ø)
mmedit/models/transformers/search_transformer.py	100.00% <100.00%> (ø)
...ls/components/stylegan2/generator_discriminator.py	86.14% <0.00%> (+1.20%)	⬆️
mmedit/models/losses/perceptual_loss.py	91.91% <0.00%> (+24.24%)	⬆️

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